Resources can be divided into three types:
- Natural resources - things found in natural world that are of use to us and that we have the technology and willingness to use.
- Human resources - skills of a population in a society.
- Material/capital resources - good and equipment already in place in a society.
- Non-renewable resources - coal, oil, diamonds - they exist in a fixed amount which is gradually or sometimes rapidly being used up.
- Sustainable resources - wood - can be deliberately renewed. They can be managed so that they are usable now but will also last into the future. Some sustainable resources - solar/wind power - renew themselves and do not need to be managed - RENEWABLE!
TAR-SAND OIL - NON RENEWABLE
Enormous reserves of tar-sands, especially in Canada. They have attracted more attention since oil prices have risen rapidly.
+ Are about 300 billion barrels of oil in the tar-sands.
+ Tar-oil extraction would make profits for major oil companies.
+ Tax benefits for countries with tar-sands.
+ Dependence on dangerous Middle Easter region would be reduced.
+ Continued production of oil would avoid costs of switching to other fuels, e.g H2.
- Produce up to 3X more CO2 than 'light' oils.
- Tar-oil extraction uses vast quantities of water - 6 barrels for each barrel of oil.
- Ancient spruce forests removed to scrape away oil-rich sands - pollution of groundwater and river will be inevitable.
- Delays - need to search for alternative technologies.
BIOFUELS - SUSTAINABLE AND RENEWABLE
Several types of biofuels - best known are ethanol and bio-diesel.
+ CO2 absorbed when grown - BUT CO2 is released when…